C++编写程序计算下列公式的值:y = x - x^3/3!+ x^5/5!- x^7/7!+ ⋯,精确到第n项
时间: 2023-05-28 11:06:30 浏览: 117
#include <stdio.h>
#include <math.h>
double factorial(int n) {
double result = 1;
for (int i = 1; i <= n; i++) {
result *= i;
}
return result;
}
double calculate(double x, int n) {
double result = x;
int sign = -1;
for (int i = 2; i <= n; i += 2) {
double term = pow(x, i) / factorial(i);
if (sign == -1) {
result += term;
} else {
result -= term;
}
sign = -sign;
}
return result;
}
int main() {
double x;
int n;
printf("请输入x和n:");
scanf("%lf %d", &x, &n);
double y = calculate(x, n);
printf("y = %lf", y);
return 0;
}
相关问题
c++编写程序计算下列公式的值:y=x-x^3/3!-x^5 /5!+x^7/7! …,精确到第n项sad
好的,以下是C++代码实现,可以计算公式y=x-x^3/3!-x^5 /5!+x^7/7! …的前n项,并精确到小数点后10位:
```c++
#include <iostream>
#include <cmath>
using namespace std;
double calcFactorial(int n){
double res = 1.0;
for(int i=2; i<=n; i++){
res *= i;
}
return res;
}
double calcPower(double x, int n){
double res = 1.0;
for(int i=1; i<=n; i++){
res *= x;
}
return res;
}
double calcY(double x, int n){
double res = x;
double sign = -1.0;
for(int i=1; i<=n; i++){
double term = sign * calcPower(x, 2*i-1) / calcFactorial(2*i-1);
res += term;
sign = -sign;
}
return res;
}
int main(){
double x;
int n;
cin >> x >> n;
double y = calcY(x, n);
cout.precision(10); //设置输出精度为小数点后10位
cout << y << endl;
return 0;
}
```
你可以输入x和n的值,程序会计算出公式的前n项,并输出结果。
C++编写程序计算下列公式的值:y = x - x^3/3!+ x^5/5!- x^7/7!+ ⋯,精确到第n项,
其中x为用户输入的实数,n为用户输入的正整数。
提示:阶乘可以用循环计算,递归计算或者利用数学库函数计算。可以定义一个函数来计算阶乘。同时,可以定义一个函数来计算每一项的值。最后,在主函数中利用循环计算所有项的和,直到计算到第n项为止。
以下是示例代码:
#include <stdio.h>
double factorial(int n)
{
double result = 1.0;
for (int i = 1; i <= n; i++)
{
result *= i;
}
return result;
}
double term(double x, int n)
{
double sign = (n % 2 == 0) ? 1.0 : -1.0;
double power = 2 * n + 1;
double denominator = factorial(power);
double numerator = sign * pow(x, power);
return numerator / denominator;
}
double series(double x, int n)
{
double sum = x;
for (int i = 1; i <= n; i++)
{
sum += term(x, i);
}
return sum;
}
int main()
{
double x;
int n;
printf("Enter x: ");
scanf("%lf", &x);
printf("Enter n: ");
scanf("%d", &n);
double y = series(x, n);
printf("y = %.10f\n", y);
return 0;
}
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